Z-Suite 3.5 Huge Bug!

I’ve just loaded a 3mf file to the Z-Suite, it’s basically a 10mm flat sheet with some holes in.
When I slice it Z-Suite puts support in the holes and puts a lid on it?
23 layers thick!
I’ve previously sliced the same model a few days ago, it was perfect, can you please fix Z-Suite 3.5, like today as I need to print this now!